Firefox is no longer capable of running on a mac that is also capable of running 32-bit applications. Chrome is also making the same jump pretty soon. The browser companies have made a determination that if you want to have a computer that retains compatibility with 32-bit mac software, you cannot look at web pages. https://nakedsecurity.sophos.com/2023/07/05/firefox-115-is-out-says-farewell-to-older-windows-and-mac-users/
@ekg @dalias I don't understand why IceWeasel was abandoned. The weasel was so cute.